code: def generate_bool_feature_with_nan() -> DataFrame:
      return Series(
          [None, 5, None, 5], name="edgecase_with_nan_bool"
      ).to_frame()
  
imports: import copy
  import numpy
  import pandas
  import pytest
  from pandas import DataFrame, Series
  from autogluon.common.features.feature_metadata import FeatureMetadata
  from autogluon.features.generators import AbstractFeatureGenerator
label_desc: Use image node_id 11 for calling the DataHelper obj's underlying member method code with example usage: obj.generate_bool_feature_with_nan() and returns: Series